S 308 over Rock Creek
GoodCarbon County, Montana · Red Lodge · Structure no. S00308000+01001
- Built
- 2003
- 22 years old
- Condition
- Good
- inspected November 2023
- Type
- Tee Beam
- Prestressed Concrete
- Length
- 72 ft
- 1 main span
- Daily traffic
- 1,253
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
S 308 over Rock Creek is a prestressed concrete tee beam carrying S 308 over Rock Creek in Carbon County, Montana. It was built in 2003, so it is 22 years old, younger than the Montana average of 47 years.
The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 1,253 vehicles a day, roughly 2% of them trucks, projected to reach 1,316 by 2043. The structure is 72 ft (22 m) long and 47 ft wide. If it were closed, the detour would be 1.2 mi (2 km).
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 9 Excellent | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was S 308 over Rock Creek built?
It was built in 2003, making it 22 years old in 2025.
What condition is S 308 over Rock Creek in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in November 2023.
How much traffic does S 308 over Rock Creek carry?
About 1,253 vehicles per day (2023 count), of which roughly 2% are trucks.
How long is S 308 over Rock Creek?
The structure is 72 ft (22 m) long with a longest span of 72 ft (22 m) and a deck 47 ft wide.
Who owns S 308 over Rock Creek?
It is owned by the State Highway Agency.